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• W2134977788 endingPage "6986" @default.
• W2134977788 startingPage "6980" @default.
• W2134977788 abstract "ABSTRACT The ability of bacterial cells to sequester cations is well recognized, despite the fact that the specific binding sites and mechanistic details of the process are not well understood. To address these questions, the cation-exchange behavior of Pseudomonas aeruginosa PAO1 cells with a truncated lipopolysaccharide (LPS) (PAO1 wbpL ) and cells further modified by growth in a magnesium-deficient medium (PAO1 wbpL − Mg 2+ ) were compared with that of wild-type P. aeruginosa PAO1 cells. P. aeruginosa PAO1 cells had a negative surface charge (zeta potential) between pH 11 and 2.2, due to carboxylate groups present in the B-band LPS. The net charge on PAO1 wbpL cells was increasingly positive below pH 3.5, due to the influence of NH 3 + groups in the core LPS. The zeta potentials of these cells were also measured in Na + , Ca 2+ , and La 3+ electrolytes. Cells in the La 3+ electrolyte had a positive zeta potential at all pH values tested. Growing P. aeruginosa PAO1 wbpL in magnesium-deficient medium (PAO1 wbpL − Mg 2+ ) resulted in an increase in its zeta potential in the pH range from 3.0 to 6.5. In cation-exchange experiments carried out at neutral pH with either P. aeruginosa PAO1 or PAO1 wbpL , the concentration of bound Ca 2+ was found to decrease as the pH was reduced from 7.0 to 3.5. At pH 3.5, the bound Mg 2+ concentration decreased sharply, revealing the activity of surface sites for cation exchange and their pH dependence. Infrared spectroscopy of attached biofilms suggested that carboxylate and phosphomonoester functional groups within the core LPS are involved in cation exchange." @default.
• W2134977788 created "2016-06-24" @default.
• W2134977788 creator A5049518552 @default.
• W2134977788 creator A5064027822 @default.
• W2134977788 creator A5079128470 @default.
• W2134977788 date "2008-11-15" @default.
• W2134977788 modified "2023-10-03" @default.
• W2134977788 title "Mechanisms of Cation Exchange by <i>Pseudomonas aeruginosa</i> PAO1 and PAO1 <i>wbpL</i> , a Strain with a Truncated Lipopolysaccharide" @default.
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• W2134977788 doi "https://doi.org/10.1128/aem.01117-08" @default.
• W2134977788 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2583508" @default.
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• W2134977788 hasPublicationYear "2008" @default.
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